Kalista Ult glitch with Vi's ultimate

I'm not sure if this is a glitch or not but either way it just feels bad, kalista can pull the soulbound out of vi's ult while she is in the damage portion of her ultimate, whats worse is when she does this Vi is stun locked for a few seconds after this happens to her, and also puts ult on CD.

The whole point of vi's ult is it puts her in high risk situations in exchanges for good damage and a unavoidable gap closer, and this neutralizes both of them.